1# Check for stdbool.h that conforms to C99. 2 3dnl Copyright (C) 2002-2006, 2009-2016 Free Software Foundation, Inc. 4dnl This file is free software; the Free Software Foundation 5dnl gives unlimited permission to copy and/or distribute it, 6dnl with or without modifications, as long as this notice is preserved. 7 8#serial 7 9 10# Prepare for substituting <stdbool.h> if it is not supported. 11 12AC_DEFUN([AM_STDBOOL_H], 13[ 14 AC_REQUIRE([AC_CHECK_HEADER_STDBOOL]) 15 16 # Define two additional variables used in the Makefile substitution. 17 18 if test "$ac_cv_header_stdbool_h" = yes; then 19 STDBOOL_H='' 20 else 21 STDBOOL_H='stdbool.h' 22 fi 23 AC_SUBST([STDBOOL_H]) 24 AM_CONDITIONAL([GL_GENERATE_STDBOOL_H], [test -n "$STDBOOL_H"]) 25 26 if test "$ac_cv_type__Bool" = yes; then 27 HAVE__BOOL=1 28 else 29 HAVE__BOOL=0 30 fi 31 AC_SUBST([HAVE__BOOL]) 32]) 33 34# AM_STDBOOL_H will be renamed to gl_STDBOOL_H in the future. 35AC_DEFUN([gl_STDBOOL_H], [AM_STDBOOL_H]) 36 37# This version of the macro is needed in autoconf <= 2.68. 38 39AC_DEFUN([AC_CHECK_HEADER_STDBOOL], 40 [AC_CACHE_CHECK([for stdbool.h that conforms to C99], 41 [ac_cv_header_stdbool_h], 42 [AC_COMPILE_IFELSE( 43 [AC_LANG_PROGRAM( 44 [[ 45 #include <stdbool.h> 46 47 #ifdef __cplusplus 48 typedef bool Bool; 49 #else 50 typedef _Bool Bool; 51 #ifndef bool 52 "error: bool is not defined" 53 #endif 54 #ifndef false 55 "error: false is not defined" 56 #endif 57 #if false 58 "error: false is not 0" 59 #endif 60 #ifndef true 61 "error: true is not defined" 62 #endif 63 #if true != 1 64 "error: true is not 1" 65 #endif 66 #endif 67 68 #ifndef __bool_true_false_are_defined 69 "error: __bool_true_false_are_defined is not defined" 70 #endif 71 72 struct s { Bool s: 1; Bool t; bool u: 1; bool v; } s; 73 74 char a[true == 1 ? 1 : -1]; 75 char b[false == 0 ? 1 : -1]; 76 char c[__bool_true_false_are_defined == 1 ? 1 : -1]; 77 char d[(bool) 0.5 == true ? 1 : -1]; 78 /* See body of main program for 'e'. */ 79 char f[(Bool) 0.0 == false ? 1 : -1]; 80 char g[true]; 81 char h[sizeof (Bool)]; 82 char i[sizeof s.t]; 83 enum { j = false, k = true, l = false * true, m = true * 256 }; 84 /* The following fails for 85 HP aC++/ANSI C B3910B A.05.55 [Dec 04 2003]. */ 86 Bool n[m]; 87 char o[sizeof n == m * sizeof n[0] ? 1 : -1]; 88 char p[-1 - (Bool) 0 < 0 && -1 - (bool) 0 < 0 ? 1 : -1]; 89 /* Catch a bug in an HP-UX C compiler. See 90 http://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html 91 http://lists.gnu.org/archive/html/bug-coreutils/2005-11/msg00161.html 92 */ 93 Bool q = true; 94 Bool *pq = &q; 95 bool *qq = &q; 96 ]], 97 [[ 98 bool e = &s; 99 *pq |= q; *pq |= ! q; 100 *qq |= q; *qq |= ! q; 101 /* Refer to every declared value, to avoid compiler optimizations. */ 102 return (!a + !b + !c + !d + !e + !f + !g + !h + !i + !!j + !k + !!l 103 + !m + !n + !o + !p + !q + !pq + !qq); 104 ]])], 105 [ac_cv_header_stdbool_h=yes], 106 [ac_cv_header_stdbool_h=no])]) 107 AC_CHECK_TYPES([_Bool]) 108]) 109